Add permission that allows cancelling notifications from other apps.
Notification cancellation fixes:
Permission should only allow cancellation of other app notifications, not enqueueing.
Fix checkapi breakage.

Squash from Idbcfd4617057984250dc4d4fa32ff55bfbb155e2
and    from I055b17873e174f71174898a7649b1e221fd8c436

Conflicts:
	core/res/res/values/cm_strings.xml
	services/java/com/android/server/NotificationManagerService.java

Change-Id: I293b4b72783bf97e849052459a8ddd09e7911510
Merge "Add permission that allows cancelling notifications from other apps. Notification cancellation fixes: Permission should only allow cancellation of other app notifications, not enqueueing. Fix checkapi breakage." into jb-mr2